Diagnostic Code Entered On: Wed Oct 06, 2010 11:00 pm
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Diagnostic Trouble Code Description:
Fuel Trim Cylinder Balance Bank 1
Possible Sensor Faults
ECM
Possible Related Diagnostic Trouble Codes
DTC P219A or P219B
Circuit / System Description
The Fuel Trim Cylinder Balance diagnostic detects a rich or lean cylinder to cylinder air/fuel ratio imbalance in each bank. The diagnostic monitors the pre-catalyst heated oxygen sensor (HO2S) signal\'s frequency and amplitude characteristics by calculating an accumulated voltage over a predetermined sample period. An imbalance is indicated when multiple samples of the accumulated voltage are consistently higher than the desired value.
